英文關鍵字
air
airpollution
atmosphere
background
carbon
chemical
chimney
cloud
design
dioxide
dirty
ecology
emissions
energy
enterprise
environment
environmental
equipment
factory
fuel
fumes
gas
globalwarming
harmful
harmfulsubstances
industrial
industry
intoxication
manufacture
manufacturing
oil
old
ozone
pipe
plant
pollution
power
production
smog
smoke
station
substance
substances
symbol
technology
toxic
urban
vapor
white
worn